Preparation method of cationic polyacrylamide

A polyacrylamide, cationic technology, applied in flocculation/sedimentation water/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the problems of difficult to remove product purity, unsuitable production and application, long reaction and polymerization time, etc. , to achieve the effect of shortening the initiation polymerization time, short polymerization reaction time, and fewer types

Active Publication Date: 2012-07-25
贾高锋 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: 1. The reaction polymerization time is long, preferably 3 to 6 hours; 2. In addition to the initiator, six kinds of auxiliary agents such as chelating agent, chain extender and chain transfer agent are added in the additive in the reaction aqueous solution. , surfactants, etc., and each additive also includes one or several substances, the sum of the dosage of various additives can be as high as 1.95% of the total monomer mass
Various additives will eventually remain in the synthetic product, which is not easy to remove and seriously affect the purity of the product; 3. Some substances in the additives are highly toxic and not suitable for production and application, such as the chain extender boric acid itself can be used as a trauma Disinfectant, oral administration can cause acute poisoning, mainly manifested as gastrointestinal symptoms, such as nausea, vomiting, abdominal pain, diarrhea, etc. It cannot be used as a raw material for water treatment agents and is used in water treatment. It has the potential to cause pollution to water bodies Toxicity; chain regulator diethylenetriamine, triethylenediamine, its vapor or mist are corrosive to the nose, throat and mucous membranes, production personnel need to wear gas masks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the first step, weigh 7g of monomer acrylamide, 2g of dimethyldiallyl ammonium chloride, and 1g of acryloyloxyethyltrimethylammonium chloride into a jar, add 23.3ml of distilled water, and stir well , prepare the monomer aqueous solution that the mass concentration of total monomer is 30%;

[0018] In the second step, add 0.02 g of urea as a solubilizer (0.2% of the total mass of the monomer) to the aqueous monomer solution prepared above, and then add 0.004 g of ethylenediaminetetraacetic acid complexing agent (0.2% of the total mass of the monomer) 0.04% of the mass), adjust the pH=9; pass nitrogen to remove oxygen, add 0.144g of inorganic initiator (the mass ratio of potassium persulfate to sodium sulfite is 1: 2), the dosage is 1.44% of the total mass of the monomer, stir evenly, Nitrogen was added to remove oxygen, and then airtight.

[0019] The third step is to put the above-prepared mixture into the ultraviolet light reaction device at the ambient temperatur...

Embodiment 2

[0023] In the first step, weigh 8g of monomer acrylamide, 1g of methacryloyloxyethyltrimethylammonium chloride, and 1g of dimethyldiallylammonium chloride into a jar, add 10ml of distilled water, and stir Uniform, prepare the monomer aqueous solution whose mass concentration of total monomer is 50%;

[0024] In the second step, add 0.05g of urea as a solubilizer (0.5% of the total mass of the monomer) to the aqueous monomer solution prepared above, and then add 0.02g of ethylenediaminetetraacetic acid complexing agent (0.5% of the total mass of the monomer) 0.2% of the mass), adjust the pH=8; pass through nitrogen to remove oxygen, add 0.015g of inorganic initiator (the mass ratio of ammonium persulfate to sodium sulfite is 2:1, and the dosage is 0.15% of the total mass of the monomer), stir evenly, Then pass nitrogen gas to remove oxygen, and then airtight;

[0025] The third step is to put the above-prepared mixture into the ultraviolet light reaction device at the indoor a...

Embodiment 3

[0029] In the first step, weigh 7g of monomer acrylamide, 1.5g of methacryloxyethyltrimethylammonium chloride, and 1.5g of dimethyldiallylammonium chloride into a jar, add 30ml of distilled water , stir evenly, prepare the monomer aqueous solution that the mass concentration of total monomer is 25%;

[0030] In the second step, add 0.005g of urea as a solubilizer (0.05% of the total mass of the monomer) to the aqueous monomer solution prepared above, and then add 0.001g of ethylenediaminetetraacetic acid complexing agent (0.05% of the total mass of the monomer) 0.01% of the mass of the monomer), adjust the pH=6; pass through nitrogen to remove oxygen, add 0.12g of organic initiator azobisisobutylamidine hydrochloride V50 (the amount is 1.2% of the total mass of the monomer), stir evenly, and pass through Into nitrogen to remove oxygen, then airtight;

[0031] The third step is to put the above-prepared mixture into the ultraviolet light reaction device at the indoor ambient t...

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PUM

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Abstract

The invention relates to a preparation method of cationic polyacrylamide. The cationic polyacrylamide is prepared by the following steps of: adding a certain amount of solubilizing agent and complexing agent into acrylamide (AM) and aqueous solution of two cationic monomers; regulating the pH value of a reaction system; then adding a certain amount of initiator; and performing the polymerization reaction under the ultraviolet light with a certain wavelength. The preparation method has the advantages that the polymerization reaction time is short; few types of auxiliaries are added; and the prepared product has high purity and is non-toxic and harmless. The cationic polyacrylamide obtained by the preparation method has multifunctionality, has the molecular weight of 1 million to 12 million, has ultralow concentration of a residual acrylamide monomer, is suitable for treatment of drinking water and sewage treatment and dehydration treatment of sludge and has excellent application prospect.

Description

technical field [0001] The invention relates to a method for preparing an aqueous solution polymer, in particular to a method for preparing a cationic polyacrylamide. Background technique [0002] At present, the flocculants used in sewage treatment plants mainly include inorganic flocculants and organic polymer flocculants. Polyacrylamide flocculant is an important organic polymer flocculant, including cationic polyacrylamide (CPAM), anionic polyacrylamide (APAM), nonionic polyacrylamide (NPAM) and zwitterionic polyacrylamide; among them, Cationic polyacrylamide (CPAM) is its high-end product. It has the advantages of excellent turbidity removal and decolorization performance. Most of the products produced by the current preparation method are affected by the use of too many additives, which affects the purity of the product and the synthesis reaction is insufficient. The monomer content is relatively large, and the residual monomer content of acrylamide after refining is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F226/02C08F2/48C02F1/56C02F11/14
Inventor 郑怀礼朱俊任苗树祥陈伟戴力熊祖平蒋贞贞
Owner 贾高锋
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